Let tan A = with A in QIII. Find the exact value for cos (2.A) = Preview TIP Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 243, 5+4) Enter DNE for Does Not Exist, oo for Infinity Get Help: Video Points possible: 1 License This is attempt 1 of 3. Post this question to forumV13 Let csc A = - with A in QIII and find 2 cos (2A) = Preview TIP Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 243, 5+4) Enter DNE for Does Not Exist, oo for Infinity Get Help: Video Points possible: 1 License This is attempt 1 of 3. Post this question to forum